Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 282248c807cd4d59…

MALICIOUS

Office (OLE) / .XLS

205.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-04
MD5: 7b4fb4a4f7a1bca65947769794b3af7e SHA-1: 98c1d3ba20691ae1433d73fb1023fd15461dc8be SHA-256: 282248c807cd4d5995504c8bcbad72c1ba6cf1d0f67a6a11a7b4a6191cc07957
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample contains an embedded Equation Editor OLE object that exploits the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the OLE object itself. The embedded ole10native payload is the direct indicator of compromise.

Heuristics 3

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
4cfb469c2cf8cee26cf148938f5b5ec3e3c9f9bf34cd080a4bbfd20449bc03aa		 ole-package OLE Ole10Native stream: MBD02A156DC/OlE10naTIvE 1964 bytes

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